[ 17.397962] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.629511] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.946894] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.841085] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 23.043910] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 28.457587] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 28.552331] kasan: CONFIG_KASAN_INLINE enabled [ 28.556751] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.569651] Dumping ftrace buffer: [ 28.573163] (ftrace buffer empty) [ 28.576844] Modules linked in: [ 28.580140] CPU: 1 PID: 3327 Comm: syzkaller124561 Not tainted 4.4.111-gc2f631b #27 [ 28.587916] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.597241] task: ffff8801d173df00 task.stack: ffff8801d14f8000 [ 28.603279] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.611519] RSP: 0018:ffff8801d14ff9f0 EFLAGS: 00010a07 [ 28.616938] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9f5b [ 28.624186] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.631440] RBP: ffff8801d14ffa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.638682] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.645924] R13: 0000000000000020 R14: ffff8801d0a20000 R15: dffffc0000000000 [ 28.653169] FS: 00000000013de880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.661370] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.667222] CR2: 0000000020ef0fe0 CR3: 00000001d2906000 CR4: 0000000000160670 [ 28.674465] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.681710] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.688951] Stack: [ 28.691069] 0000000000000000 ffff8801d0a20158 ffff8801d14ffa60 ffffffff825b9f81 [ 28.699040] ffff8801d0a20170 ffffed003a14402b ffffed003a14402e ffff8801d0a20168 [ 28.707012] dead4ead00000000 ffff8801d0a20140 0000000000000000 0000000000000000 [ 28.715014] Call Trace: [ 28.717581] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.724047] [] sg_finish_rem_req+0x2b5/0x340 [ 28.730075] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.736198] [] ? sg_get_rq_mark+0x142/0x190 [ 28.742149] [] sg_read+0x8c2/0x1490 [ 28.747403] [] ? __check_object_size+0x154/0x35b [ 28.753778] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.760413] [] ? fsnotify+0xee0/0xee0 [ 28.765849] [] ? avc_policy_seqno+0x9/0x20 [ 28.771721] [] do_loop_readv_writev+0x141/0x1e0 [ 28.778024] [] ? security_file_permission+0x89/0x1e0 [ 28.784756] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.791403] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.798049] [] do_readv_writev+0x5dd/0x6e0 [ 28.803902] [] ? vfs_write+0x530/0x530 [ 28.809411] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.815543] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.821499] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.827617] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.834432] [] ? __fsnotify_parent+0xbc/0x340 [ 28.840559] [] ? avc_policy_seqno+0x9/0x20 [ 28.846424] [] vfs_readv+0x78/0xb0 [ 28.851599] [] SyS_readv+0xd9/0x240 [ 28.856851] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.863424] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.869990] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.876539] Code: 96 a4 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 28.903135] RIP [] __free_pages+0x21/0x90 [ 28.909028] RSP [ 28.912895] ---[ end trace 868e56fcf1d552fc ]--- [ 28.917645] Kernel panic - not syncing: Fatal exception [ 28.923463] Dumping ftrace buffer: [ 28.926982] (ftrace buffer empty) [ 28.930667] Kernel Offset: disabled [ 28.934270] Rebooting in 86400 seconds..